Gun-bore sighting-telescope.



A. KGNIG.

GUN BORE SIGHTING TELESCOPE. APPLICATION FILED F331, 1908.

1 9 15. K0 r p A d 6 Tu n m a P ALBERT KQNTG, Q33 JENA, ASSIGEGE 'lG THEFZRM 019- GARE ZEISS, GE Elfin, GEEMANY.

stilt-383E STGETL'HG-TELESSQPE.

specification of Letters Patent.

Application filed February It, 1903. Serial ito. 33,791.

To all whom it may concern:

Be it lrnown that l, Annnnr Kerrie, doctor of philosophy, a citizen ofthe German Empire, and residing at Carl-Zeiss strasse, Jena, in theGrand-Duchy of SaZe-Weimar, Germany, have invented a new and usefulGun-Bore SightingTelescope of which the following is a specification.

The invention relates to gun bore sighting telescopes for adjusting thesighting device proper or" the gun or for testing such adjustment, whichis correct when the line of aim of the gun sighting device in its zeroposition is parallel to the axis of the bore A telescope of this kind istherefore adapted to be inserted into the here oi the gun with its lineof sight parallel to the axis oi the here, so that in the condition oicorrect adjustment glust defined this line may be substituted for thehere axis. justing the gun sighting device is then fected by setting theline oi oi this de vice to its zero position, directing uhe gun until avery distant noint lies the line of sight of the bore telescope andvarying the position of the gun sig ting device until its line of aimlikewise includes the very distant po nt. The telescopic bore insertionpiece may widely vary size, according to whether it is designed forordnance or for machine guns, rifles and other small arms. According tothe present invention, in the said optical appliances to be insertedinto a gun, the direction of inspection oi the ocular is inclined sothat the ey -point approximately in the line of oi sighting deviceproper of the gun. For this purpose an ocular having an obtusely brokenaxis is employed, so that the hinder part of this axis may intersect thesaid line of aim. The advantage or" this new arrangement consists inthat-by a more rapid succession of the two observations, the one withthe telescope of the insertion piece the other with the sighting deviceproper, which must be repeated alternately when the ob-. server is to beenabled to adjust exactly the gun sighting device-a more reliablecomparison of these observations is rendered possible. Formerly the heador even the entire body had to be moved in changing from one observationto the other, whereby scale through the ocular portion of the insertionpiece.

the example as shown the insertion piece consists of two portions, anobjective portion a inserted into the muzzle, and an is s,',""-1 -'l'ocuiai portion 0 inserted into the loading chamber. principal opticalcomponents are the usual ones: in objective portion a, the ohjective a";in the ocular portion 5, the cross-wires i)", the field-lens e and theeye-lens 2 The inclination of the direction of inspection of the cool1', which raises the eye-point 0 into the line of aim of the gunsighting device, is in the example shown eir ected by retracting prism Esupposed to a form a separate optical component and to he located behindthe eye-lens e Thus the axis of the complete ocular b b 5 in this caseis obtusely broken in the prism 5 This prism might also be replaced by arefleeting prism, suitably one which has the efiect oi erecting theimage at least in the vertical direction.

l claim:

optical appliance comprising an ohjective, an ocular, the axis of whichis do tusely broken, and a sighting mark arranged in the focal planecommon to both the objective and the ocular, this appliance beingadapted to be inserted into the bore of a gun with its line of sightparallel to the axis of the bore and with the hinder part of its ocularaxis intersecting the line of aim oi the sighting device.

annnnr ironic.

VJitnesses:

Tact sinuous, l nrrz Simone.

